This is the realm of mindless beings who have only bodies without consciousness. So are they a bunch of statues? Maybe there's no point in trying to conceptualize it. Just curious, if anyone has insights. Thanks.

Rain soddens what is kept wrapped up,But never soddens what is open;Uncover, then, what is concealed,Lest it be soddened by the rain.

Jechbi wrote:This is the realm of mindless beings who have only bodies without consciousness. So are they a bunch of statues? Maybe there's no point in trying to conceptualize it. Just curious, if anyone has insights. Thanks.

They have no mentality of any kind. They are just gigantic lumps of rūpa lounging about in the Brahma world. They differ from statues in that they are kammically generated material continua (rūpa-santati). When the kamma that generated this rebirth is exhausted then they break up and a new citta-santati gets kickstarted by a past citta from the life before they became impercipient beings.

No, not that big. If they are born in the standing posture they are said to be 12 yojanas (192 km) in height. But that only applies to Brahmas reborn as Asaññasattas. Humans reborn there will be in the sitting posture and so will look rather shorter.